Alright, look the fuck here.
In chemistry, all of the atoms on the periodic table are labeled and ordered based on the fucking number of protons.
Those fucking protons determine the element.
This fucker here fucking said 19, not 18, not 17, 19 FUCKING PROTONS.
If we go to our fucking periodic table fucking reference guide, find the one with 19.
We'll find that the fucking element in question is Potassium.
Now, every fucking element also has a fucking abbreviation.
These are fucking generally based off of fucking Latin or the element itself.
Hydrogen, H, Helium He, etc.
So if we fucking check that in reference to Potassium
We will see a BIG ASS BOLD MOTHER FUCKING LETTER K
He was then fucking replying k.
K is a shortened version of OK.
OK is generally a positive response to fucking everything.
But "k" is a more sarcastic way, as if saying cool story, bro.
Sarcasm is when you saying something and mean generally the opposite.
So he really meant, wow I couldn't give two fucks.
Or, good for you.